and white house spokesperson jay carney said iran's warnings show that global sanctions are hurting. >> it reflects the fact that iran is in a position of weakness. it's the latest round of iranian threats. it's confirmation that tehran is under increasing pressure for its continued failures to live up to its international obligations. iran is isolated. and it's seeking to divert attention from its behavior and domestic problems. >> holman: iran's warnings to the west have escalated as it faces the possibility of curbs on its vital oil exports. a string of bombings struck southern afghanistan today, killing at least 13 people. three separate explosions erupted in the city of kandahar, one in the morning and the others in the evening. one of the bombs was onboard a motorcycle that blew up at a police checkpoint. four police officers and a child were among those killed. the other blasts went off within minutes of each other at a busy intersection. in egypt, prosecutors began to make their case in the trial of former president hosni mubarak. they accused him of tyranny and corruption du